Description:

In many scenarios a redundant connection of network devices is required, which can only be implemented by redundant cabling. In order to prevent a loop, which would cripple the whole network, the Spanning Tree Protocol (STP) was created.    

In vielen Szenarien ist eine redundante Anbindung der Netzwerk-Geräte gewünscht, was nur durch eine redundante Verkabelung realisiert werden kann. Damit es dabei nicht zu einem Loop kommt, welcher das gesamte Netzwerk lahmlegt, wurde das Spanning Tree Protocol (STP) erschaffen. Dadurch wird immer nur die kürzeste Strecke aktiv geschaltet und der Datenverkehr darüber übertragen. Bei einem Ausfall der aktiven Verbindung wird auf eine der weiteren Verbindungen gewechselt.

This article describes how Rapid Spanning Tree Protocol (RSTP) can be configured on an XS series switch.

In contrast to STP topology changes happen much faster with RSTP, thus minimizing downtimes.



Requirements:


Procedure:

1) Configuring RSTP:

1.1) Connect to the webinterface of the device and go to the menu Switching → Spanning Tree → Switch.

1.2) Modify the following parameters and click Submit:

1.3) Go to the tab CST and optionally modify the Bridge Priority. 

The lower the value for Bridge Priority, the higher the probability that the switch becomes Root Bridge.

1.4) Go to the menu System → Port → Summary.

1.5) Make sure, that the STP Mode is set to Enabled for all ports, where RSTP should be used (default setting). 

1.6) Click on Save Configuration in the top right-hand corner to save the configuration as the start configuration.

The start configuration is retained even if the device is restarted or there is a power failure.

As an alternative you can also save the configuration as start configuration via the CLI with the command write memory.

1.7) Acknowledge the save process by clicking OK.



2) Controlling the Spanning Tree status for the individual switch ports:

2.1) Go to the menu Switching → Spanning Tree → CST Port.

2.2) The status information for the individual switch ports can viewed in the table Spanning Tree CST Port Summary.